Electronic device with recesses

ABSTRACT

The disclosure relates to an electronic device, including a flexible substrate, a driving structure layer, a display structure layer and a touch layer. The flexible substrate includes an area and a main area adjacent to the area. The driving structure layer is disposed on the flexible substrate. The driving structure layer includes an insulating structure, and the insulating structure includes a plurality of recesses. The display structure layer is disposed on the driving structure layer. The touch layer is disposed on the driving structure layer. A portion of the touch layer is disposed on the area of the flexible substrate. At least a part of the plurality of recesses is disposed on the area of the flexible substrate.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation application of and claims the priority benefit ofU.S. patent application Ser. No. 17/670,507, filed on Feb. 14, 2022. Theprior U.S. patent application Ser. No. 17/670,507 is a continuationapplication of and claims the priority benefit of U.S. patentapplication Ser. No. 16/697,086, filed on Nov. 26, 2019. The prior U.S.patent application Ser. No. 16/697,086 is a continuation application ofand claims the priority benefit of U.S. patent application Ser. No.15/480,383, filed on Apr. 6, 2017, which claims the priority benefit ofU.S. provisional application Ser. No. 62/441,579, filed on Jan. 3, 2017.The entirety of each of the above-mentioned patent applications ishereby incorporated by reference herein and made a part of thisspecification.

TECHNICAL FIELD

The disclosure relates to a display device.

BACKGROUND

Nowadays, electronic devices such as cellular telephones, personalcomputers, digital cameras or other consumer electronic equipment, havegained widespread use. In the manufacturing process of conventionaldisplay devices for the electronic devices, after the formation of adisplay structure layer on a main substrate, the main substrate is cutto form a plurality of display devices. However, micro-cracks will beformed at edges of the substrate of the display devices. Once themicro-cracks spread to the area where the display structure layerlocates on, the display structure layer will be destroyed. Moreover, ifthe display devices are adapted to be flexible, the spread of themicro-cracks will be more serious, and the endurability of the displaydevices is decreased significantly.

SUMMARY

The disclosure provides a display device with the plurality of recessesto stop the spread of the micro-cracks of the display device.

A display device according to an embodiment of the disclosure includes asubstrate, a driving structure layer, a display structure layer and atouch layer. The substrate includes a bending area and a main areaadjacent to the bending area. The driving structure layer is disposed onthe substrate. The driving structure layer comprises an insulatingstructure, and the insulating structure comprises a plurality ofrecesses. The display structure layer is disposed on the drivingstructure layer. The touch layer is disposed on the driving structurelayer. A portion of the touch layer is disposed on the bending area ofthe substrate. At least a part of the plurality of recesses is disposedon the bending area of the substrate.

A display device according to an embodiment of the disclosure includes asubstrate, a driving structure layer, a display structure layer and atouch layer. The substrate includes a bending area and a main areaadjacent to the bending area. The driving structure layer is disposed onthe substrate. The driving structure layer comprises a crack stopper.The display structure layer is disposed on the driving structure layer.The touch layer is disposed on the driving structure layer. A portion ofthe touch layer is disposed on the bending area of the substrate. Atleast a part of the crack stopper is disposed on the bending area of thesubstrate.

Based on the above, in the disclosure, the driving structure layerincludes a plurality of recesses. In this way, the spread of themicro-cracks may be mitigated, or the endurability of the display devicemay be improved.

To make the above features and advantages of the disclosure morecomprehensible, several embodiments accompanied with drawings aredescribed in detail as follows.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the disclosure, and are incorporated in and constitutea part of this specification. The drawings illustrate embodiments of thedisclosure and, together with the description, serve to explain theprinciples of the disclosure.

FIG. 1 is a schematic cross-sectional view of a display device accordingto an embodiment of the disclosure.

FIGS. 2-4 are schematic top views of display devices according to threeembodiments of the disclosure.

FIG. 5 is a schematic top views of display devices according to anotherembodiment of the disclosure.

FIG. 6 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure.

FIG. 7 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure.

FIG. 8 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure.

FIG. 9 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure.

FIG. 10 is a schematic partially enlarged cross-sectional view of aplurality of recesses of a display device according to an embodiment ofthe disclosure.

FIG. 11 is a schematic partially enlarged cross-sectional view of aplurality of recesses of a display device according to anotherembodiment of the disclosure.

FIG. 12 is a schematic partially enlarged cross-sectional view of aplurality of recesses of a display device according to an embodiment ofthe disclosure.

FIGS. 13A to 13E are schematic partially enlarged top views of thecorners of the display device according to five embodiments of thedisclosure.

FIG. 14 is a schematic cross-sectional view of FIG. 13A along I-I line.

FIGS. 15A to 15H are schematic partially enlarged top views of thestraight edge of the display device according to eight embodiments ofthe disclosure.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

Reference will now be made in detail to the present preferredembodiments of the disclosure, examples of which are illustrated in theaccompanying drawings. Wherever possible, the same reference numbers areused in the drawings and the description to refer to the same or likeparts.

The foregoing and other technical contents, features, and effects of thedisclosure will be clearly described in the following detaileddescriptions of the embodiments with reference to the accompanyingdrawings. The language used to describe the directions such as up, down,left, right, front, back or the like in the reference drawings isregarded in an illustrative rather than in a restrictive sense.Therefore, the directional wording is used to illustrate rather thanlimit the disclosure. For example, in the following descriptions, thedescription that a first object is on a second object covers theembodiment where the first object and the second object are in directcontact and the embodiment where the first object and the second objectare not in direct contact. Besides, in the embodiment where the firstobject and the second object are not in direct contact, there may beanother object or simply a space between the first object and the secondobject.

FIG. 1 is a schematic cross-sectional view of a display device accordingto an embodiment of the disclosure. Referring to FIG. 1 , the displaydevice 100 includes a substrate 110, a driving structure layer 120, adisplay structure layer 130 and a touch layer 140. The substrate 110 maybe a flexible substrate or a rigid substrate. The flexible substrate canbe made of plastic, and the rigid substrate can be made of glass, whichis not limited. The substrate 110 has a bending area 112 and a main area114 adjacent to the bending area 112. The bending area 112 can beconsidered as a bent portion of the substrate 110, and the main area 114can be considered as an unbent portion of the substrate 110. In someembodiments, the main area 114 can be flat. However, in otherembodiments, the main area 114 can be not flat and include uneven orcurved surface. The bending area 112 can have greater bending extentthan the main area 114. In other words, a greatest curvature of thebending area 112 is greater than a greatest curvature of the main area114.

The bending process can be conducted before the display device ispresented to the consumers (or users). FIG. 1 shows the state of thedisplay device, in which the substrate 110 has been bent. Alternatively,according to some embodiments, when a flexible substrate is used as thesubstrate, the bending process can be conducted by the consumer. Thatis, originally, the substrate of the display device can be flat, andthen the consumer can bend the substrate to have the bending areaaccording to requirement, thus obtaining the display device as shown inFIG. 1 . In the present disclosure, the bending area can mean a portionthat has been bent, or a portion that will be bent by the consumers.

The driving structure layer 120 is disposed on the substrate 110. Thedriving structure layer 120 comprises an insulating structure. Theinsulating structure includes a plurality of recesses 122. The pluralityof recesses 122 could act as a crack stopper. The recess can be in theform of opening or slit. The display structure layer 130 is disposed onthe driving structure layer 120. The touch layer 140 is disposed on thedriving structure layer 120. A portion of the touch layer 140 isdisposed on the bending area 112 of the substrate 110. At least a partof the plurality of recesses 122 is disposed on the bending area 112 ofthe substrate 110.

Since the driving structure layer 120 includes the plurality of recesses122 disposed on the bending area 112 of the substrate 110, even thoughthe micro-cracks might exist at the edge of the substrate 110 and/or theedge of the driving structure layer 120, the spread of the micro-crackscan be stopped by the plurality of recesses 122. In this way, the spreadof the micro-cracks may be mitigated, or yield of the substrate 110, thedriving structure layer 120, the display structure layer 130 and thetouch layer 140 can in increased, or the endurability of the displaydevice may be improved. Meanwhile, it may be unnecessary to worry aboutthe repeatedly bending will cause the spread of the micro-cracks on thedisplay device 100.

The driving structure layer 120 may comprise driving circuits anddriving elements constituted from a plurality of insulating layers andconductive layers, which is not limited thereto. The display structurelayer 130 may comprises a plurality of organic light emitting diode(OLED) components, a plurality of micro-LED or other suitable displaystructure, which is not limited thereto. The touch layer 140 maycomprises a plurality of insulating layers and conductive layers, whichis not limited thereto. The driving structure layer 120, a displaystructure layer 130 and a touch layer 140 may not be separated clearly.For example, in some embodiment, portion of the touch layer 140 may bebetween the driving structure layer 120 and the display structure layer130, and another portion of the touch layer 140 is located on thedisplay structure layer 130. The bending area 112 of the substrate 110is a portion of the substrate 110 with curve surface. The bending area112 could be at side of the substrate 110 as shown in FIG. 1 . However,if the display device is designed to be foldable like a book, thebending area could be in the middle region of the substrate, which isnot limited thereto. FIG. 1 is a schematic drawing for facilitatingunderstanding of the present embodiment only.

FIGS. 2-4 are schematic top views of display devices according to threeembodiments of the disclosure. The area filled with dots is the locationof the plurality of recesses where the plurality of recesses isdistributed. In the display devices of FIGS. 2-4 , the distributionlocation of the plurality of recesses 222A, 222B and 222C surrounds thetouch layer 240. The distribution location of the plurality of recesses222A, 222B and 222C are located at edges of the substrates 210A, 210Band 210C. The distribution locations of the plurality of recesses 222Aand 222B are continuous strip areas, and the distribution location ofthe plurality of recesses 222C is a discontinuous strip area, which isnot limited thereto. The substrate 210A and the substrate 210B havedifferent shapes, which is not limited thereto. FIG. 5 is a schematictop view of a display device according to another embodiment of thedisclosure. In another aspect, the distribution location of theplurality of recesses 222D surrounds the display structure layer 230 asshown in FIG. 5 . The substrates 210D and the substrates 210A have thesame shapes. The display structure layer and the touch layer exist atthe four embodiments of FIGS. 2-5 , but only one of the displaystructure layer and the touch layer is shown in each embodiment. InFIGS. 2 to 5 , the substrate (210A, 210B, 210C or 210D) can be bent inthe position of the edge to form the bending area. For example, in FIG.2 , three dash lines are shown. The substrate 210A can be bent along atleast one of the dash lines to form the bending area 112. Similarly,regarding the display devices shown in FIGS. 3 to 5 , the substrate canbe bent along at least one of the dash lines to form the bending area,which is not limited thereto.

Referring to FIG. 1 , the substrate 110 further comprises a first edge116, the touch layer 140 comprises a second edge 142 adjacent to thefirst edge 116, a part of the plurality of recesses 122 is disposedbetween the first edge 116 and the second edge 142. A minimum distancebetween the portion of the plurality of recesses 122 and the first edge116 is a first distance D10, and the first distance D10 is between 0.1um and 1000 um, which is not limited thereto. In the present embodiment,the display structure layer 130 is completely covered by the touch layer140. Since the plurality of recesses 122 is disposed between the firstedge 116 and the second edge 142, the plurality of recesses 122 locatesoutside the display structure layer 130. Therefore, the spread of themicro-cracks can be stopped by the plurality of recesses outside thedisplay structure layer 130, and the display structure layer 130 can bekept away from the micro-cracks.

FIG. 6 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure. Referringto FIG. 6 , the display device 300 is similar to the display device 100of FIG. 1 , and the similar detail thereof is not repeated. A maindifference therebetween is that the display device 300 further comprisesa capping layer 150. The capping layer 150 is disposed between thedisplay structure layer 130 and the touch layer 140. The capping layer150 protects the display structure layer 130 and the driving structurelayer 120 from the deterioration due to moisture penetration, thepost-processes and the like. The capping layer 150 of the presentembodiment also provides flat surface for disposing the touch layer 140.The capping layer 150 may comprise a plurality of stacked layer, and theplurality of stacked layer may comprise inorganic layers and organiclayer(s) between the inorganic layers. The display structure layer 130of the present embodiment includes a pixel electrode layer 132, alight-emitting layer 134 and a common electrode layer 136. A pixeldefining layer 138 is disposed on the pixel electrode layer 132 and hasan opening. The light-emitting layer 134 is disposed in the opening ofthe pixel defining layer 138 and between the pixel electrode layer 132and the common electrode layer 136 to form light-emitting OLEDs foremitting light to constitute images for a user. The pixel electrodelayer 132 can be an anode, and the common electrode layer 136 can be acathode. Or, alternatively, the pixel electrode layer 132 can be acathode, and the common electrode layer 136 can be an anode.

Referring to FIG. 6 , the driving structure layer 120 can furtherinclude an insulating structure 180. The insulating structure 180 canincludes a plurality of recesses 122 as shown in FIG. 1 . In someembodiments, the insulating structure 180 can include at least oneinsulating layer. In some embodiments, the insulating structure 180 caninclude multiple insulating layers. The insulating layer can be aplanarization layer, a gate insulating layer, a buffer layer, apassivation layer and so on, which is not limited thereto. Specifically,in some embodiments, the driving structure layer 120 includes aplurality of thin film transistor (TFT) 124, only one TFT 124 is shownin FIG. 6 . The TFT 124 could electrically connect to the pixelelectrode layer 132 and controls the light-emitting OLEDs. The TFT 124can includes a buffer layer 126A, an active layer 1241, a gate layer1242, a gate insulating layer 126B, a passivation layer 126C, asource/drain layer 1243, and a planarization layer 126D. The bufferlayer 126A is disposed on the substrate 110 and between the substrate110 and the active layer 1241. The gate insulating layer 126B isdisposed between the active layer 1241 and the gate layer 1242. Thepassivation layer 126C covers the gate layer 1242, and the planarizationlayer 126D covers the source/drain layer 1243. Based on this TFTstructure of FIG. 6 , the insulating structure 180 can include at leastone of the buffer layer 126A, the gate insulating layer 126B, thepassivation layer 126C, and the planarization layer 126D, which is notlimited thereto. For example, the insulating layer 180 includes only thebuffer layer 126A, the gate insulating layer 126B, and the passivationlayer 126C in another embodiment, which is not limited thereto.

FIG. 7 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure. Referringto FIG. 7 , the display device 400 is similar to the display device 300of FIG. 6 , and the similar detail thereof is not repeated. A maindifference therebetween is that the touch layer 440 of the displaydevice 400 includes an upper touch electrode layer 442 and a lower touchelectrode layer 444. The upper touch electrode layer 442 is disposed onthe capping layer 150, and the lower touch electrode layer 444 isdisposed between the display structure layer 130 and the capping layer150. The lower touch electrode layer 444 and the common electrode layer136 can be the same layer, and can be made of the same material.Specifically, first, an electrode layer can be formed, and thenpatterned by photolithography to form the lower touch electrode layer444 and the common electrode layer 136.

FIG. 8 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure. Referringto FIG. 8 , the display device 500 is similar to the display device 300of FIG. 6 , and the similar detail thereof is not repeated. A maindifference therebetween is that the touch layer 540 of the displaydevice 500 is disposed between the display structure layer 130 and thedriving structure layer 120. The touch layer 540 and the pixel electrodelayer 132 can be the same layer, and can be made of the same material.Specifically, first, an electrode layer can be formed, and thenpatterned by photolithography to form the touch layer 540 and the pixelelectrode layer 132. Or, alternatively, the touch layer 540 can be thesame layer and be made of the same material as the source/drain layer1243.

FIG. 9 is a schematic partially enlarged cross-sectional view of adisplay device according to an embodiment of the disclosure. Referringto FIG. 9 , the display device 600 is similar to the display device 300of FIG. 6 , and the similar detail thereof is not repeated. A maindifference therebetween is that the display structure layer 630 of thedisplay device 600 includes a plurality of micro-LEDs 632. In thepresent embodiment, two micro-LEDs 632 can be disposed in one pixel. Inanother embodiment, only one micro-LED 632 can be disposed in one pixel,which is not limited thereto. Each of the micro-LEDs 632 includes afirst electrode 632A, a first type doped semiconductor layer 632B, aquantum well layer 632C, a second type doped semiconductor layer 632Dand a second electrode 632E. The first type doped semiconductor layerand the second type doped semiconductor layer can be of different dopingtypes. For example, the first type can be N-doped, and the second typecan be P-doped, and vice versa. The micro-LEDs 632 of the presentembodiment are vertical LEDs for exemplary purposes. However, in otherembodiments, flip-chip LEDs or other light emitting devices may also beadopted in the display structure layer 630. While bonding the micro-LEDs632 onto the display device 600, the substrate 110 will be squeezed, andthe possibility of the spread of the micro-cracks may increase.Therefore, the insulating structure 180 with the plurality of recesses122 (shown in FIG. 1 ) is very important.

FIG. 10 is a schematic partially enlarged cross-sectional view of aninsulating structure with a plurality of recesses structure in thebending area of a display device according to an embodiment of thedisclosure. As described above, the insulating structure 180 can includeat least one insulating layer, or can include multiple insulating layer.When the insulating structure 180 includes multiple insulating layers,the plurality of recesses can have different depths. For example, inFIG. 10 , the insulating structure 180 can include the buffer layer126A, the gate insulating layer 126B, and the passivation layer 126C.The insulating structure 180 can include a plurality of recesses on themain area and on the bending area. FIG. 10 shows the part of theplurality of recesses on the bending area. Recesses 122A1, 122A2, and122A3 are formed in the insulating structure 180. The recess 122A1 isformed in the passivation layer 126C, the recess 122A2 is formed in thepassivation layer 126C and the gate insulating layer 126B. The recess122A3 is formed in the passivation layer 126C, the gate insulating layer126B, and the buffer layer 126A. The surface 118 of the substrate 110 isonly exposed in some of the recesses, but the surface 118 is not exposedin other recesses. For example, as shown in FIG. 10 , the surface 118 ofthe substrate 110 is exposed by the recess 122A3, but not exposed by therecess 122A1 and recess 122A2, which is not limited thereto.

Referring to FIG. 10 , the insulating structure 180 includes recesses122A1, 122A2, and 122A3 with different depths, which is not limitedthereto. The recesses with different depths can stop the spread of themicro-cracks occur in different depths. Referring to FIG. 10 , therecess 122A3 includes a sidewall 122S and a bottom 122B. The insulatingstructure 180 includes an angle θ formed by the sidewall 122S and thebottom 122B, and the angle θ can be between 10° and 80°. In theexperiments, the probability of the spread of the micro-cracks is 23%when the taper angle θ is 90°, and the probabilities of the spread ofthe micro-cracks are 10%, 8%, 7%, 9% and 7% when the taper angle θ is80°, 60°, 50°, 20° and 10°, respectively. In some embodiments, the taperangle θ can be between 10° to 80°. In some embodiments, the taper angleθ can be between 20° to 60°.

The sidewalls of the recesses included in the insulating structure 180can be smooth or can have a step profile. For example, as shown in FIG.10 , the sidewalls of the recesses 122A1, 122A2, and 122A3 are smooth.However, the sidewalls 122B1 of the recess 122B as shown in FIG. 11 hasa step 122B2, which is not limited thereto.

Referring to the FIG. 11 , the recess 122B is formed in the insulatingstructure 180. The insulating structure 180 can include stackedinsulating layers including the first silicon oxide layer 112, the firstsilicon nitride layer 114, the second silicon oxide layer 116 and thesecond silicon nitride layer 118, which is not limited thereto. Thetotal thickness of the silicon oxide layer (such as a sum of a thicknessT12 of the first silicon oxide layer 112 and a thickness T16 of thesecond silicon oxide layer 116) may be larger than the total thicknessof the silicon nitride layer (such as a sum of a thickness T14 of thefirst silicon nitride layer 114 and a thickness T18 of the secondsilicon nitride layer 118). For example, the total thickness of thesilicon oxide layer may be 1.5 times larger than the total thickness ofthe silicon nitride layer, and the total thickness of the silicon oxidelayer may be smaller than 15 times of the total thickness of the siliconnitride layer.

FIG. 12 is a schematic partially enlarged cross-sectional view of aninsulating structure with a plurality of recesses structure in thebending area of a display device according to an embodiment of thedisclosure. The insulating structure 180 can include a plurality ofrecesses on the main area and on the bending area. FIG. 12 shows thepart of the plurality of recesses on the bending area. Referring to FIG.12 , the insulating structure 180 comprises a first recess 122C and asecond recess 122D. A minimum width of the first recess 122C is a firstwidth W12, a minimum width of the second recess 122D is a second widthW14, and the first width W12 is different from the second width W14,which is not limited thereto.

The first recess 122C has a first depth D12, the second recess 122D hasa second depth D14, and the first depth D12 is different from the seconddepth D14. Therefore, the spread of the micro-cracks occur in differentdepths can be stopped. The first recess 122C includes a first sidewall122CS and a first bottom 122CB, and the second recess 122D includes asecond sidewall 122DS and a second bottom 122DB. The insulatingstructure 180 includes a first angle θ1 formed by the first sidewall122CS and the first bottom 122CB, and a second angle θ2 formed by thesecond sidewall 122DS and the second bottom 122DB. The first angle θ1and the second angle θ2 can be in the range of 10° to 80°, for example,in the range of 20° to 60°. The first angle θ1 and the second angle θ2can be the same or different. The quotient obtained by dividing thefirst angle θ1 by the second angle θ2 may be smaller than 1.5 and largerthan 0.8. The corner at the top of the first recess 122C may have asmooth profile as shown in FIG. 12 . Therefore, the mitigation effect ofthe spread of the micro-cracks can be further enhanced.

In some embodiments, the display device of the present embodiment mayfurther comprise an organic layer 160 that covers the first recess 122Cand the second recess 122D of the plurality of recesses. In someembodiments, the organic layer 160 can be formed by the same fabricatingprocess of the organic layer of the capping layer 150 or other layers asshown in FIG. 6 , but the organic layer 160 can be a layer differentfrom the layers shown in FIG. 6 , which is not limited thereto. Or, insome embodiments, the organic layer 160 can be the same layer of thepixel defining layer 138 of the display structure layer 130. The organiclayer 160 can mitigate the stress concentration occurred at theplurality of recesses, and the spread of the micro-cracks may bemitigated. The thickness T20 of the organic layer 160 is larger thanboth the first depth D12 of the first recess 122C and the second depthD14 of the second recess 122D. The thickness T20 of the organic layer160 may be 1.5 times larger than both the first depth D12 of the firstrecess 122C and the second depth D14 of second recess 122D.

FIGS. 13A to 13E are schematic partially enlarged top views of thecorners of the display device according to five embodiments of thedisclosure. For example, the corners shown in FIGS. 13A to 13E can showthe area C in FIG. 2 . FIGS. 13A to 13E are shown in microscopicviewpoint, and FIGS. 2-5 are shown in macroscopic viewpoint. A pluralityof recesses similar as that of FIGS. 13A to 13E may be distributed inthe areas filled with dots shown in FIGS. 2-5 . Referring to FIG. 13A,in the part of the plurality of recesses on the bending area, theplurality of recesses 722 comprises at least one first recess 722A andat least one second recess 722B. A plurality of first recesses 722A anda plurality of second recesses 722B can be disposed in the insulatingstructure 180 in the present embodiment, which is not limited thereto.The first recesses 722A are extending along a first direction D1, thesecond recesses 722B are extending along a second direction D2, and thefirst direction D1 is different from the second direction D2. The firstdirection D1 may be perpendicular to the second direction D2, which isnot limited thereto. The first recesses 722A and the second recesses722B can be disposed on the bending area. The first recesses 722A andthe second recesses 722B extending along different directions can stopthe spread of the micro-cracks occur in different direction. Meanwhile,the first recesses 722A and the second recesses 722B may have arc-shapededged 722A1 and 722B1 for reducing the cusp angles to mitigate theoccurrence of the micro-cracks at the cusp angles, which is not limitedthereto.

According some embodiments, the recesses in the insulating structure canbe of various depths, and can be of various widths. For example,referring to FIG. 13A and FIG. 14 , a minimum width of the first recess722A is a first width W1, a minimum width of the second recess 722B is asecond width W2, and the first width W1 can be different from the secondwidth W2. In addition, the first recess 722A has a first depth D21, thesecond recess 722B1 has a second depth D22, and the first depth D21 canbe different from the second depth D22.

Referring to FIG. 13B, the plurality of recesses comprises recesses 722Cextend along four different directions. Referring to FIG. 13C, theplurality of recesses comprises recesses 722D having continuouscrisscross-shapes. Referring to FIG. 13D, the plurality of recessescomprises recesses 722E having continuous crisscross-shapes and straightshapes. Referring to FIG. 13E, the plurality of recesses comprisesrecesses 722F having curve shapes and straight shapes.

FIGS. 15A to 15H are schematic partially enlarged top views of thestraight edge of the display device according to eight embodiments ofthe disclosure. Referring to FIG. 15A, the plurality of recessescomprises a chain of recesses 822A having S-shapes. Referring to FIG.15B, the plurality of recesses comprises a plurality of recesses 822Bhaving wider straight shapes. Referring to FIG. 15C, the plurality ofrecesses comprises a plurality of recesses 822C having thinner straightshapes. Referring to FIG. 15D, the plurality of recesses comprises aplurality of recesses 822D having circle shapes. Referring to FIG. 15E,the plurality of recesses comprises a plurality of recesses 822E havingcontinuous crisscross-shapes. Referring to FIG. 15F, the plurality ofrecesses comprises a plurality of recesses 822F having spiral-shapes.Referring to FIG. 15G, the plurality of recesses comprises a pluralityof recesses 822G having continuous S-shapes with wider pitch. Referringto FIG. 15H, the plurality of recesses comprises a plurality of recesses822H having continuous S-shapes with narrow pitch.

In view of the foregoing, in the display device according to theembodiments of the disclosure, the micro-cracks would not spread to thedisplay area of the display device owing to the plurality of recesses ofthe driving structure layer. The mitigating effect for the spread of themicro-cracks is more significant for the foldable display device. Thedisplay device of the disclosure has batter reliability or the displayquality can be kept well.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of thedisclosure without departing from the scope or spirit of the disclosure.In view of the foregoing, it is intended that the disclosure coversmodifications and variations of the disclosure provided they fall withinthe scope of the following claims and their equivalents.

What is claimed is:
 1. An electronic device, comprising: a flexiblesubstrate, comprising an area, and a first edge; a driving structurelayer, disposed on the flexible substrate and comprising a second edgeadjacent to the first edge, wherein the driving structure layercomprises an insulating structure, and the insulating structurecomprises a plurality of recesses, and the first edge of the flexiblesubstrate is outside the driving structure layer; and a touch sensorlayer, disposed on the driving structure layer and comprising a thirdedge adjacent to the second edge, wherein the second edge of the drivingstructure layer is outside the touch sensor layer, wherein a minimumdistance between an edge of a part of the plurality of recesses and thefirst edge is a first distance, the first distance is greater than orequal to 10 um and less than or equal to 140 um, and wherein the secondedge is disposed between the first edge and the third edge.
 2. Theelectronic device of claim 1, wherein the part of the plurality ofrecesses is disposed between the second edge and the third edge.
 3. Theelectronic device of claim 1, wherein the plurality of recessescomprising a first recess and a second recess, the first recess isextending along a first direction, the second recess is extending alonga second direction, and the first direction is different from the seconddirection.
 4. The electronic device of claim 3, wherein the first recesshas a first depth, the second recess has a second depth, and the firstdepth is different from the second depth.
 5. The electronic device ofclaim 3, wherein a minimum width of the first recess is a first width, aminimum width of the second recess is a second width, and the firstwidth is different from the second width.
 6. The electronic device ofclaim 1, wherein the plurality of recesses comprises a first recess anda second recess, the first recess has a first angle defined by a firstsidewall and a first bottom, the second recess has a second angledefined by a second sidewall and a second bottom, and the first angle isdifferent from the second angle.
 7. The electronic device of claim 6,wherein a ratio of the first angle and the second angle is between 0.8and 1.5 except 1.0.
 8. The electronic device of claim 6, wherein whenthe first angle is larger than the second angle, a first width of thefirst recess is smaller than a second width of the second recess.
 9. Theelectronic device of claim 1, wherein the first edge, the second edgeand the third edge do not overlap each other.
 10. An electronic device,comprising: a flexible substrate, comprising a first edge; a drivingstructure layer, disposed on the flexible substrate and comprising asecond edge adjacent to the first edge, wherein the driving structurelayer comprises a crack stopper, and the first edge of the flexiblesubstrate is outside the driving structure layer; and a touch sensorlayer, disposed on the driving structure layer and comprising a thirdedge adjacent to the second edge, wherein the second edge of the drivingstructure layer is outside the touch sensor layer, wherein a minimumdistance between an edge of the crack stopper and the first edge is afirst distance, and the first distance is greater than or equal to 10 umand less than or equal to 140 um, and wherein the second edge isdisposed between the first edge and the third edge.
 11. The electronicdevice of claim 10, wherein at least a part of the crack stopper isdisposed between the second edge and the third edge.
 12. The electronicdevice of claim 10, wherein at least a part of the crack stopper isdisposed on the area of the flexible substrate.
 13. The electronicdevice of claim 10, wherein the crack stopper comprises a plurality ofrecesses, the plurality of recesses comprising a first recess and asecond recess, the first recess is extending along a first direction,the second recess is extending along a second direction, and the firstdirection is different from the second direction.
 14. The electronicdevice of claim 13, wherein the first recess has a first depth, thesecond recess has a second depth, and the first depth is different fromthe second depth.
 15. The electronic device of claim 13, wherein aminimum width of the first recess is a first width, a minimum width ofthe second recess is a second width, and the first width is differentfrom the second width.
 16. The electronic device of claim 10, whereinthe crack stopper comprises a plurality of recesses, the plurality ofrecesses comprises a first recess and a second recess, the first recesshas a first angle defined by a first sidewall and a first bottom, thesecond recess has a second angle defined by a second sidewall and asecond bottom, and the first angle is different from the second angle.17. The electronic device of claim 16, wherein a ratio of the firstangle and the second angle is between 0.8 and 1.5 except 1.0.
 18. Theelectronic device of claim 16, wherein when the first angle is largerthan the second angle, a first width of the first recess is smaller thana second width of the second recess.
 19. The electronic device of claim10, wherein the first edge, the second edge and the third edge do notoverlap each other.